Knowledge factors are something the user knows and are commonly used for authentication.
Examples include passwords, PINs, and security questions.
Why Other Options Are Incorrect:
Option A (ID card): This is a possession factor (something you have).
Option C (Security token): A security token is also a possession factor.
Option D (Fingerprint): This is a biometric factor (something you are).
References:
NIST Authentication Guidelines (SP 800-63)
"Multi-Factor Authentication Best Practices" – Gartner
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